This chapter presents a synthesis of the discussions in the preceding chapters. The main conclusion is that the left cerebral hemisphere, in comparison with the right, is specialized for motor selection of both the oral and manual musculature. This is particularly true of movements specifiable within intrapersonal space, and it holds whether the movements to be programmed are components of a communication system or not. A consequent theme throughout is that human communication has been influenced by the characteristics of the motor programming systems that control the relevant oral and manual musculature. Lateralization of function in the brain, manual apraxia, visuoconstructional disorders, disorders in manual sign language, and sex differences in functional brain organization are discussed.
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